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alluvium
(redirected from Alluvial deposits)

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alluvium

The material deposited on land by virtue of the process of accretion. The accretion process occurs when rivers or other waters deposit silt and mud on land,and thus create more land; the silt and mud making up the new land is called alluvium.
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Placer gold mining is the mining of alluvial deposits (deposits of sand and gravel in modern or ancient stream beds) for minerals.
Alaska Gold Rush by G M Stephens / Finance and Investment community
De Beers, which operates the Williamsons mine in Tanzania, has found a number of kimberlites at the site over the past two years and is currently evaluating them, since the alluvial deposits close to the Madui pipe which produced some 116,000cts in 1997, are nearly exhausted.
DeBeers unfazed by low diamond prices by Misser, Francois / African Business
The metal occurs as nuggets or grains in rocks, underground "veins" and in alluvial deposits.
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